Tool holder



FIG. 1 is a perspective view of the design;

FIG. 2 is a front elevation view of the design;

FIG. 3 is a side elevation view, the opposite side being a mirror image thereof;

FIG. 4 is a top plan view of the design;

FIG. 5 is a rear elevation view of the design; and,

FIG. 6 is a bottom plan view of the design. 

The ornamental design for a tool holder, as shown and described. 